新老混凝土植筋加固的接触模型分析

随着混凝土结构老化问题的日益严重，植筋加固技术得到越来越广泛的应用。建立了新老混凝土植筋的接触模型，从植筋根数、布置形式以及植筋深度等方面，研究了新老混凝土植筋加固结构的抗剪切/拉拔承载力的影响。主要计算结果表明:植筋的布置形式对承载力的影响不大；植筋深度在（10~15）d为宜（d为钢筋直径），过小承载力得不到加强，过大则无明显作用；植筋胶体强度的提升可在一定范围上增强承载力。

Analysis of implant-steel reinforcement between new and old concrete

Since the aging of concrete structure is becoming more and more serious，the technique of implant-steel reinforcement is widely used.The model of implant-steel between new and old concrete was built this paper.The influences of the bearing capacity of shearing and drawing were studied from these aspects，such as the numbers of steel bars，the form and depth of implant-steel.The main calculation results showed that:there is little impact in the form of implant-steel on the bearing capacity.The depth of the implanting-steel is in（10~15）d（d is the diameter of the steel bar）.If this depth is not enough，the carrying capacity is not enhanced，and the deep depth has no obvious effect if the depth is too large.The enhancement of the strength of the implanting-steel colloid can improve the bearing capacity on a certain range.